PC with internet, but browsers only work for a few minutes after starting

[FelipeVianna]

I'm Brazilian, so, excuse my English.

Good Morning,

Since last night my desktop has a problem in which all browsers (IE, Edge and Chrome) stop working after 1 or 2 minutes of Windows starts, even though the PC is connected to the internet via cable. All other tasks that require internet work normally (online games by Steam or battle.net, torrent, for example), only browsers do not work. If I restart the PC, the same thing happens, it works for 1 or 2 minutes and then stops working, displaying the error "err_connection_closed" in Chrome.
I know the problem is not the modem because I already connected it to other equipment and it worked normally. I also tried to do a USB docking with the cell phone, to use his internet, and the same thing happened, it only works for 1 or 2 minutes.

I already tried:

1. Change DNS to Google DNS;
2. The commands in the CMD:

ipconfig / release
ipconfig / renew
ipconfig / flushdns
ipconfig / registerdns
nbtstat -rr
netsh int ip reset all
netsh winsock reset

1. I ran ADWCleaner and MalwareBits, both found no threat
2. Clear the cache and other browser tools.

I thought about doing restore, but the PC came from the store with the restore point option disabled and I did not realize it, so it did not create any point since I bought it in January. Windows 10 also claims that it did not find any recovery images. However, even if I make an image, I face another problem: its processor does not have on-board video, so if I lose my video card drive during recovery, I will be without video.

My OS is the original Windows 10 Pro, running only genuine programs. I did not install any new programs yesterday, before the behavior appeared.
May someone help me?

 

[DelJo63]

Verify ping by name resolves to an ip address, eg PING GOOGLE.COM

if this fails, then you have an issue with DNS

 

[MaikuTech]

Try ipconfig/all take a screenshot of that and bring it back here.